There is a stark difference between me and my younger sister.
Who am I?
Edit (hint 1): There are also some similarities. For example, both of us are not exactly pacific.
I am the city of York. My younger sister is New York, we are not on the Pacific Ocean and the House of York is the basis for the House of Stark.
ps: This is my first attempt at a riddle. While it may be not new, I invented it by myself and wanted to share it.